Improvement in bubglae-alaems



N. P. LARSEN.

- Burglar Alarm.

No. 81,913. Patented Sept. 8, 1868.

N.PETER5, PHOTO-LITNOGRAPNER. WASHINGTON. D C.

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N. P. LARSEN, OFCHIGAGOQIILLINOIS.

Letters Patent No. 81,913, dated September 8, 1868.

IMPROVEMENT IN BURGLAR-ALARMS.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, N. LABSEN', of Denmark, resident of Chicago, in thecounty of Cook, and State of Illinois, have invented new and usefulImprovements in Burglar-Alarms;" and I do hereby declare that thefollowing is a full and exact description thereof, reference. being hadto the accompanying drawings, making part of this specification.

The nature of my invention consists in the arrangement of the lever toproduce the ringing of the bell, in connection with the arrangementofthe indicator, showing whether the alarm is in working prder or not;also, in providing a key, winding the clock-work of the alarm, witha camso arranged and used in combination with a pistol as to discharge thepistol when the bell commences to ring. It consists also in a bobbin ofthread attached to the box, enclosing the alarm-machinery, said threadbeing used for the connection of machinery with doors, windows, andother objects.

To enable others skilled'in the art to which my invention appertains tomake and use said invention, Iwill proceed to describe its constructionand operation.

With an ordinary clock-work escapement, A, hammer B is connected, forthe purpose of ringing thebcll C. Said hammer is provided with a pin, 6,and the rod B is provided with a stop, 6'. i

A lever, D, supported by a sheave, R, and provided with a hook, d, atits end, has its inner end secured to the plate E, said plate, providedwith a pin, f, which, when in contact with pin 6 of the hammer B,prevents the last fromstriking the hell. v

The plate E pivots around pin e, and is held in proper place bycoil-spring F, attached to the base, G, and the wire H being securedalso to the said plate at the pivot e, the result is that when lever Dis moved in or out of the box V, the bent-up end of the wire H moves tothe right or left, and thehand it that sets on the end of said wire thusindicates whether pins f and Z: are in contact or not, and consequentlywhether the alarmmachinery is in or out of order. Square opening a ismade in the top of the box V, to show the hand it.

Sliding plate I has the purpose to press against the stop 5' of thehammers rod and put the alarm out of work.

The key K is provided with cam L, and is set on the shaftk, by which thespring of the clock-work A is wound, and isat the same time placedinside of the-guard of the cocked and capped pistol M, secured to thetop of the box V, so that when the alarm commences to sound, the shaft kand the key K commence to revolve,"-

' and the cam L, pressing on the trigger N of the pistol, dischargesthesame.

Bobbin 6,, with thread wound on, is set in a frame, W, and is providedwith handle 0, the lower plate .of its frame being secured to the slideP, moving in the grooves provided in the top of the box V.

The operation consists in this, that the plate I is pressed inside, andthe clock-work wound. Bobbin O is taken, ed the box, the end of thethread hooked on to the lever D, and is passed to the door, window, orsome other object, and secured to them in such a manner, that theslightest pull on the thread will pull or push in the lever and producethe alarm.

If wire is used in place of thread, that wire is connected with thelever D.

In order to set the alarm ready for work, the-plate I is carefully movedout, so as to release the hammer,

' and the pins 6 andf are put in contact, the key K is put in its placeand the pistol adjusted. At the slightest pull orpush of thelever D,,thealarm is produced and the pistol is fired.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. The lever D, plate E, with pinf, spring F, and wire H, all combinedand operating as and in the manner herein described, and for the purposespecified. u

2. In combination with the above,'the pin 6 of the hammer B, and thebobbin 0, arranged substantially a set forth. a

3. The key K, when used as described, and provided with cam L, for thepurpose of operating the trigger N, as herein shown and specified.

' 'N. P. LARSEN.

Witnesses:

J. B. TUROHIN, F. H. OooLnY.

